gecko-dev/dom/presentation/PresentationAvailability.cpp

122 строки
3.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/PresentationAvailabilityBinding.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIPresentationDeviceManager.h"
#include "nsIPresentationService.h"
#include "nsServiceManagerUtils.h"
#include "PresentationAvailability.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_CYCLE_COLLECTION_CLASS(PresentationAvailability)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PresentationAvailability, DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PresentationAvailability, DOMEventTargetHelper)
tmp->Shutdown();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(PresentationAvailability, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(PresentationAvailability, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PresentationAvailability)
NS_INTERFACE_MAP_ENTRY(nsIPresentationAvailabilityListener)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
/* static */ already_AddRefed<PresentationAvailability>
PresentationAvailability::Create(nsPIDOMWindowInner* aWindow)
{
RefPtr<PresentationAvailability> availability = new PresentationAvailability(aWindow);
return NS_WARN_IF(!availability->Init()) ? nullptr : availability.forget();
}
PresentationAvailability::PresentationAvailability(nsPIDOMWindowInner* aWindow)
: DOMEventTargetHelper(aWindow)
, mIsAvailable(false)
{
}
PresentationAvailability::~PresentationAvailability()
{
Shutdown();
}
bool
PresentationAvailability::Init()
{
nsCOMPtr<nsIPresentationService> service =
do_GetService(PRESENTATION_SERVICE_CONTRACTID);
if (NS_WARN_IF(!service)) {
return false;
}
nsresult rv = service->RegisterAvailabilityListener(this);
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
nsCOMPtr<nsIPresentationDeviceManager> deviceManager =
do_GetService(PRESENTATION_DEVICE_MANAGER_CONTRACTID);
if (NS_WARN_IF(!deviceManager)) {
return false;
}
deviceManager->GetDeviceAvailable(&mIsAvailable);
return true;
}
void PresentationAvailability::Shutdown()
{
nsCOMPtr<nsIPresentationService> service =
do_GetService(PRESENTATION_SERVICE_CONTRACTID);
if (NS_WARN_IF(!service)) {
return;
}
nsresult rv = service->UnregisterAvailabilityListener(this);
NS_WARN_IF(NS_FAILED(rv));
}
/* virtual */ void
PresentationAvailability::DisconnectFromOwner()
{
Shutdown();
DOMEventTargetHelper::DisconnectFromOwner();
}
/* virtual */ JSObject*
PresentationAvailability::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto)
{
return PresentationAvailabilityBinding::Wrap(aCx, this, aGivenProto);
}
bool
PresentationAvailability::Value() const
{
return mIsAvailable;
}
NS_IMETHODIMP
PresentationAvailability::NotifyAvailableChange(bool aIsAvailable)
{
return NS_DispatchToCurrentThread(NewRunnableMethod
<bool>(this,
&PresentationAvailability::UpdateAvailabilityAndDispatchEvent,
aIsAvailable));
}
void
PresentationAvailability::UpdateAvailabilityAndDispatchEvent(bool aIsAvailable) {
mIsAvailable = aIsAvailable;
NS_WARN_IF(NS_FAILED(DispatchTrustedEvent(NS_LITERAL_STRING("change"))));
}